struct FvtToolbar: ViewModifier {
    var title: String 
    var rightTitle: String 
    var rightAction: ()->()
    
    init(_ title:String, _ rightTitle:String, _ rightAction:@escaping ()->()){
        self.title = title 
        self.rightTitle = rightTitle 
        self.rightAction = rightAction 
    }
}

struct MapView: UIViewRepresentable {
    func makeUIView(context: Context) -> MKMapView {
        let mapView = MKMapView()
        return mapView 
    }

    func updateUIView(_ uiView: MKMapView, context: Context){
        uiView.setRegion(
            MKCoordinateRegion(center: ..., span: ...),
            animated: true)
    }
}

ContentView().environmentObject(AppState())